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Decimal expansion of (1/2)(1 + sqrt(-7 + 4*sqrt(5))).
4

%I #4 Feb 13 2018 19:18:18

%S 1,1,9,7,1,8,5,7,5,5,3,7,6,4,2,0,2,4,9,1,9,7,0,6,0,4,4,8,2,0,5,5,8,5,

%T 5,7,4,8,5,0,5,5,7,0,7,1,9,9,0,3,9,7,8,7,2,9,5,2,2,2,5,0,5,7,7,3,9,7,

%U 4,1,8,0,3,4,0,4,5,0,0,1,0,3,1,9,4,5

%N Decimal expansion of (1/2)(1 + sqrt(-7 + 4*sqrt(5))).

%H Clark Kimberling, <a href="/A298752/b298752.txt">Table of n, a(n) for n = 1..10000</a>

%e constant = 1.1971857553764202492... = positive zero of x^2 - x + 2- sqrt(5).

%t r = (1/2)*(1 + Sqrt[-7 + 4 Sqrt[5]])

%t RealDigits[N[r, 100], 10][[1]]; (* A298752 *)

%Y Cf. A298749, A298750, A298751.

%K nonn,easy,cons

%O 1,3

%A _Clark Kimberling_, Feb 13 2018